Polarized ringer-magnet.



No. 866,760. PATENTED M1224.,l 1907. P. H. WHITMAN.

POLAVRIZED RINGBR MAGNET.

v PrLIoA-TION FILED D110. 31.1906.

2 SHEETS-SHEET 1.

No. 866,760. PATENTED SEPT. 24, 1907. F. H. WHITMAN.

POLARIZBD RIN-GER MAGNET. APBLIOATION FILED DBO. 31,1906.

2 SHEETS-SHEET 2;

mE mmm: pnl-ns ce., "sumaron, n, c,

. tionally engage the bridge.

PATENT OFFICE.

FRANCIS H. WHITMAN, OF CAMBRIDGE, MASSACHUSETTS.

POLARIZED RINGER-MAGNET.

Specification of Letters Patent.

Patented Sept. 24, 1907.

Application filed December 31,1906. Serial NO- 350,120.

To all whom 'it may concern:

Be it known that I, FRANCIS II. WHITMAN, a citizen 0f the United States, residing at Cambridge, in the county of Middlesex and State of Massachusetts, have invented a certain new and useful Improvement in Polarized Ringer-Magnets, of which the following is a specification, reference being had therein to the accompanying drawings.

One object of the invention is to provide a simple and effective means for securing the electro magnets in fixed relation to each other.

Another object of the invention is to provide for the armature a yoke support which is xedly held by the cores of the electro magnets and to provide simple mechanism for adjusting the distance between the armature and the poles or cores of the electro magnets.

Another object of the invention is to provide means by which the electro magnets are held in fixed relation with each other in such manner as to permit the easy removal oi either one of the electro magnets and the substitution of another one therefor without disturbing the remaining electro magnet.

Another object is to attach the permanent magnet in such manner that it may be detached without disturbing the adjustment of the other parts.

The invention will be fully understood from the following description taken in connection with the accompanying drawings, and the novel features thereof are pointed out and clearly defined in the claims at the close of the specification.

In the drawings,-Figure 1 is a front elevation of a polarized ringer magnet embodying the invention. Fig. 2 is a vertical section on line 22 of Fig. l enlarged. Fig. 3 is an enlarged front elevation partly in section, the bells and supporting table therefor being removed and the windings of the electro magnets being diagrammatically shown so as to more clearly show the cores. Fig. 4 is a section on line 44 of Fig. 3A Fig. 5 is an enlarged detail of the grooved nut which binds the bridge to the stem of the yoke. Fig. 6 is an enlarged detail plan of the bifurcated spring washer which straddles the neck of the grooyed nut to fric- Fig. 7 is a cross-section on line 7-7 oi Fig. 6. Fig. 8 is a sectional detail of the core of one of the electro magnets, showing also the yoke and armature.

Referring to the drawingsfvthe apparatus shown in the drawings as embodying the invention contains two electro magnets l, 1, each provided with a core 2 which is secured to a connecting strap 3 as will be described, this strap 3 serving as a bracket by which the apparatus is attached to a suitable table or support 4 which may be the side of the box or other suitable support on which are mounted the bells 5.

A permanent magnet 6 is secured at one end to the strap 3 by a screw 33 and extends alongside the electro magnets at some greater length than the electro magnets, and at its other end it is turned so as to extend beneath the armature and its support.

The electro magnets l are secured to the strap 3 by screws 7 which pass through holes in the strap and are screwed into the tapped out ends of the cores 2. The other ends of the cores 2 extend beyond the heads of the spools S and the projecting end of each is formed with a transverse groove 9, forming a flange head 10. A yoke ll is formed with a slot l2 at each end thereof wide enough to receive the necks formed by the grooves 9 of the cores, these slots forming bifurcated ends of the yoke which straddle the necks of the cores formed by the grooves, the yoke being thick enough to iit snugly within the grooves. The longitudinal distance from the inner end of one slot l2 to the inner end of the other slot 12, as indicated by the dotted line l5, is enough to prevent the two electro magnets from being drawn up quite parallel with each other when the screws 7 are set up. The electro magnets are secured to the strap 3 by screws 7 passing through the strap 3 and extending axially into the ends of the cores 2. When these screws 7 are set up, the tendency is to draw the electro magnets into a perpendicular position with relation to the face of the strap 3, and thus into parallel relation with each other. Before the screws are fully set up, however, the yoke ll is placed in position at the opposite ends ofthe electro magnets with the slotted ends l2 engaging the grooves of the corgs, the magnets slightly diverging from each other toward the ends engaged by the yoke 1l by reason of the distance between the slots being as already stated sufficient to prevent the cores from being brought parallel with each other. As the screws are set up, drawing the cores of the electro magnets more nearly into parallel relation with each other, the grooved necks of the cores will be caused to grip the slotted ends l2 of the yoke more and more rmly, thereby binding the yoke and the electro magnets firmly together.

The lines 31-31 in Fig. 3 are drawn through the axes of the cores, and show the divergence of the cores. The lines 32-32 are parallel with each other and indicate the position that the axes of the cores would occupy if the coros did not diverge.

Proj eeting from the outer face of the yoke ll, preferably midway thereof at a point in a line joining the axes ofthe two cores of the magnets, is a post or stud lG which passes freely through a hole l7 in the armature 18 and is threaded to receive a flanged tapped out sleeve or adjusting nut 19 having a'tubular neck 190 which passes through a hole in the bridge 20. The bridge 20 is formed with upturned ends forming arms 201, and the yoke ll is formed with laterally extending arms 2l, 22, each of which is slotted at the end to receive the upturned arms 201 of the bridge, said slots being of proper size and location for the said upturned arms 201 to t closely therein. Projecting inward from the upturned arms 201 are the pivot bearings 23 on which the armature 18 is pivoted. The neck 190 is formed with an annular groove 191 which is straddled by a forked friction washer which as shown is a cupped out spring clip 24. This spring clip 24 presses againstI the inner face of the bridge 20 and clamps the said bridge against the iiange head ol the nut 19, The bridge is thus held securely in position by reason ol' the body of the bridge being clamped between the head ot the screw 19 and the spring clip 24 and the upturned arms 201 engaging in the guide slots 2l0 and 220 in the arms 21 and 22 oi the yoke ll. By turning the nut 19, the bridge 20 will be moved toward or l'rom the yoke 11, thereby limiting the vibratory movement oi the oscillating armatuie.

Secured to the armature 1S is a lever 25 which extends up through a slot 26 in the yoke 1l and through a slot 27 in the permanent magnet 3, also through the table 4, carrying at its upper end a bell tapper 28 which, as the armature vibrates, alternately taps the bell 5.

The bridge 20 being clamped between the flange head of the nut 19 and the spring clip 24, and the arms 201 being engaged in the guide slots 210 and 220 of the yoke 11, the said yoke and bridge are bound together in whatever' position they are adjusted relative to each other. By means oi the screws 7 and the slotted yoke 1l, the two electro magnets are clamped firmly in posi tion independently oi each other, so that ii it be desired at any time to remove either one ol the electro magnets to replace it b-y another, or ier any other purpose, either one oi said electro magnets maybe easily removed by simplyremoving the table 4 from the strap 3 and then withdrawing either one oi the screws 7 according to Whichever electro magnet it is desired to replace, and then such electro magnet may easily Abe slipped out Without disturbing the other one. It is also apparent that by turning the nut 19 the distance between the armature and the cores 9 of the electro magnets may be varied and adjusted according to the extent oi vibration desired.

The permanent magnet 6 is, as already described, secured directly to the strap 3, and this connection is independent of the means by which the electro magnets are secured to said strap by screws 7 and the permanent magnet is also entirely free l'rom any connection with the yoke 11 and bridge 20 which support the other ends of the electro magnets. Thus the permanent magnet may be easily removed and replaced by another without interfering in any way with the adjustment oi the ringer.

I claim as my invention:

l. In a polarized ringer magnet, two electro magnets, each electro magnet having a core which at one end extends beyond the end oi the said magnet, said extending ends being each formed with a transverse groove, a `voke having slotted ends which embrace `the nec s of said cores formed by said grooves, a strap to which said electro magnets are attacher] at their other ends by means of screws which are .screwed axially into the ends of said cores, the distance between the inner ends of the slots formed in said yoke being suflicient so that when said members are assembled.'

the slotted yoke will hold the cores in divergent relation to each other in the direction ol' the grooved ends, andby setting up said screws, the said .slotted yoke will be clamped between said grooved cores.

2. In a polarized ringer magnet, two electro magnets, a. support therefor to which said magnets are secured at one end, means for securingsaid magnets to the said support tending to draw them into parallel relation to each other, each electro magnet having a core which at the opposite end from said support extends beyond the end of the said magnet. said extending' ends being each formed with a transverse groove. a yoke having slotted ends which embrace the grooved necks of said cores and hold them in a slightly divergent relation t0 each other, said slotted ends being brought into clamping`- engagement with said grooved necks when the securing means 1`or the opposite ends are set up.

3. In a polarized ringer magnet, two electric magnets, a support therefor to which said magnets are secured at one end, means for securing said magnets to the said support tending to draw them into parallel relation to each other, each electro magnet having|- a core which at the opposite end from said support extends beyond the end of the said nmgnet, said extending ends being each formed with a transverse groove, a yoke having slotted ends which em` brace the grooved necks ot said cores and are spaced apart to hold them in a slightly divergent relation to each other when fully assembled, said slotted ends being brought into clamping engagement with said grooved necks of the cores when the securing means t'or the opposite ends are set up. n stud projectingl outward from said slotted yoke in a line parallel with the cores ot said magnets, a bridge secured to said slotted yoke by a ilangcd tubular sleeve passing through said bridge and screwed onto said stud and a friction washer which clamps said bridge against the'hcad of said flanged sleeve.

4. ln a polarized ringer magnet, two electro magnets, a support therefor to which said magnets are secured at one end, means l'or securing said magnets to said support tending to draw them into parallel relation to each other, each electro magnet having a core which at the opposite end from said support extends beyond the end of the said magnet, said extending ends being each formed with a transverse groove, a voke having slotted ends which embrace the grooved necks of said cores and are spaced apart to hold them in a slightly divergent relation to each other when fully assembled. said slotted ends being brought into clamping' engagement with said grooved necks oi. the cores when the securing means for the opposite ends are set up, a stud projecting outward from said slotted yoke in a line parallel with the cores of said magnets, a bridge secured to said yoke by a llanged tubular sleeve passing through said bridge and screwed onto said stud, means for clamping said bridge against the flanged head of said sleeve, whereby said bridge may be held at a lixed distance from said yoke and a vibrating armature pivoted to said bridge.

In a polarized ringer magnet, two electro magnets, a support therefor to which said magnets are secured at one end, means for securing said magnets to said support tending to draw them into parallel relation to each other, each electro magnet having a core which at the opposite end from said support extends beyond the end oi the said magnet, said extending ends being each formed with a trans verse groove. a yoke having slotted ends which embrace the grooved necks ol said cores and are spaced apart to hold them in a slightly divergent relation to each other when fully assembled, said slotted ends being brought into clamping engagement with said grooved necks of the cores when the securing means for the opposite ends are set up, a stud projecting outward from said slotted yoke in a line parallel with the cores of said magnets, guide slots in the sides of said yoke, a bridge having arms which engage said guide slots in said yoke, a flanged' tubular sleeve which passes through said bridge and screws onto the stud which proiects from said yoke, means i'or clamping said bridge against the flanged head of said tubular sleeve, the said tubular sleeve being adjustable on said stud whereby said bridge may be adjusted toward and from said yoke, said guide slots and clamping means holding said bridge firmly in its adjusted position. a vibrating armature between said yoke and said bridge and pivot bearings in said arms of the bridge for said armature.

G. In a polarized ringer magnet, two electro magnets, a strap to which said electro magnets are secured at one 'end by screws passing through said yoke and extending axially into the ends oi the cores of said electro magnets, the other ends of said cores extending beyond the heads of said divergent re see-,veo Si magnets, said extending ends being each formed with a transverse groove, a yoke having' slotted ends which embrace the grooved necks ot said cores and hold them in a slightly divergent relation to each other when said screws are set up, said slotted ends being brought into clamping engagement with the said grooved necks when said screws are set up in the opposite end.

7. ln a polarized ringer magnet, two electro magnets, a strap to which said electro magnets are secured at one end by screws passing through said strap and extending axially into the ends of the cores et' said electro magnets, the other ends ot' said cores extending beyond the heads of -said magnets, said extending ends being each formed with a transverse groove, a yoke having slotted ends which ein` brace the grooved necks ol' said cores and h oldthem in a slightly divergent relation to each other when said screws are set up, said slotted ends being brought into clamping engagement with the said grooved necks when said screws are set up in the opposite end, a screw threaded stud projecting outward from said slotted yoke in a line parallel with the cores oi' said magnets, a bridge secured to said slotted yoke by means ol' a tapped out ilanged sleeve passing through said bridge and screwed onto said stud, means l'or clamping said bridge against the hanged head ot' said sleeve, and a vibrating armature pivoted to said bridge between the bridge and d slotted yoke.

S. ln a polarized ringer magnet, two electro magnets, a i ap to which said magnets are secured at one end, means for securing said magnets to the said strap tending to draw them into parallel relation to each other, each elec tro magnet having a core which at the opposite end from said s rap extends beyond the head of the said magnet, said extending ends being each formed with a transverse groove, a yoke having slotted ends which embrace the gl'ooved necl's of said cores and hold them in a slightly ,ion to each other, said slotted ends being brought into clamping engagement with said grooved necks when the securing means t'or the opposite ends are set up and a permanent magnet secured te said strap by means independent ot the means which secure said electro magnets to said strap.

9. ln a polarized ringer magnet, two electro magnets having cores which at one end extend beyond the heads of said magnets, said extending ends being formed with transverse grooves, a yoke having slotted ends which engage said grooved extensions of the cores, a bridge having upturned arms which engage with slots in the sides of said yoke, a screw threaded stud which projects outwardly l'rom said slotted yoke intermediate its ends, a nut having a tubular tapped out neck which passes through a hole in said bridge and screws onto said screw threaded stud, means for clamping said bridge against the head ot' said Init, said bridge being adjustable toward and from said slotted yoke by means o'l said nut and being held in its adjusted position with relation to said yoke by said nut and clamping means and the engagement of the arms of the bridge with said slotted yoke, and a vibrating armature pivoted between said yoke and the bridge by pivots journaled in the arms ol said bridge.

10. ln a polarized ringer magnet, a vibrating armature, an adjustable support for said armature comprising a yoke having slotted ends which engage the cores ot said electro magnets, a bridge having arms which engage with guide slots in the sides of said yoke, a screw threaded stud projecting outwardly from said yoke parallel with the axis of said electro magnets, and a nut having a tubular neck which passes through said bridge and screws onto said threaded stud which projects from said yoke.

11. In a polarized ringer magnet, two electro magnets, each having a core which projects at one end thereof, said projecting ends being formed with transverse grooves, a yoke having slotted ends which engage the grooves in said cores, a bridge, a vibrating armature pivoted to said bridge, means ior securing said bridge to said slotted yoke in adjustable relation thereto, whereby said armature may be adjusted at varying distances from the cores of said electro magnets.

12. In a polarized ringer magnet, two electro magnets each having a core which projects at one end thereof, said projecting ends being formed with transverse grooves, a yoke having slotted ends which engage the grooves in said cores, a bridge having arms which engage slots in the sides of said yoke, a screw threaded stud which projects outward from said yoke parallel with the cores of said eleetro magnets, a llanged sleeve which passes through said bridge and is tapped out to screw onto the said stud, a transverse groove in said sleeve, a friction washer which straddles the neck of said groove and clamps said bridge against the iianged end of said sleeve and a vibrating armature pivoted to the arms of said bridge, said bridge being adjustable toward and from said yoke by means of said sleeve.

12%A ln a polarized ringer magnet, two electro magnets each having a core which projects at one end thereof, said projecting ends being formed with transverse grooves, a yoke having slotted ends which engage the grooves in said cores, a bridge having arms which engage slots in the sides ol said yoke, a screw threaded stud which projects outward from said yoke parallel with the cores of said electro magnets, a flanged sleeve which passes through said bridg and is tapped out to screw onto the said stud, a transverse groove in said sleeve, a spring clip which straddles the neck of said groove and clamps said bridge against the i'langed end of said sleeve and a vibrating armature pivoted to the arms of said bridge, said bridge being adjustable toward and from said slotted yoke by means of said sleeve, and a strap to which the other ends of said electro magnets are secured by means of screws which pass through said strap and extend axially into the ends of said cores, the distance between the slots of said yoke being spaced with such relation to the distance between the screws which secure the electro magnets to said strap that said slotted yoke will clamp the magnets in divergent relation with each other when the screws which secure them to the strap are set up.

l-i, In a polarized ringer magnet, two electro magnets, each having a core which projects at one end of the magnet, said projecting ends being formed with transverse grooves, a yoke having slotted ends which engage the grooves in said cores, means for holding said cores in clamping engagement with said slotted yoke, an armature,

an armature supporting bridge and adjustable means for securing said bridge to said yoke, whereby said bridge may be adjusted to vary the distance between the armature andv the magnet cores.

15. vin a polarized ringer magnet, two electro magnets, each having a core, a strap to which said cores are secured at one end -by means which tend to draw the said cores into parallel relation to each other, the other ends of said cores projecting beyond the heads of said magnets and each being formed with a transverse groove, a yoke having slotted ends which engage the grooves in said cores and prevent the cores from being drawn into parallel relation by the said attaching means for the,other end of the core, an armature supporting bridge and adjustable means tor securing said bridge to said yoke, whereby said bridge may be adjusted to vai y the distance between the armature and the magnet cores, and an armature pivoted to said bridge.

1G. In a polarized ringer magnet, two electro magnets each having a core, a support to which said cores are secured at one end by means which tend to draw the said cores into parallel relation to each other, the other ends of said cores projecting beyond the ends of said magnets and each being formed with a transverse groove, a yoke having slotted ends which engage the grooves in said cores and prevent the cores trom being drawn into parallel relation by the said attaching means for the other ends of the cores, an armature and an armature support connected with said yoke.

ln testimony whereof I aiiix my signature, in presence ot' two witnesses.

FRANCIS H. WHITMAN.

Witnesses WILLIAM A. CornLAND, GEORGE .T. GALBRAITH. 

